#10829: Simplification in the RHS of rules -------------------------------------+------------------------------------- Reporter: afarmer | Owner: Type: bug | Status: patch Priority: high | Milestone: 7.10.3 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10528 | Differential Revisions: Phab:D1246 -------------------------------------+------------------------------------- Comment (by bgamari): Someone correct me if I'm wrong but it seems like this change carries a bit of risk: Could this not result in a failure in optimization in a library with incorrect phasing annotations? We should definitely check this against Stackage or some similar smoke-test to ensure that libraries with incorrect phasing aren't adversely affected by this change as I don't have much confidence that such a regression would appear in nofib (as we've already seen in the case of `text`). Also, have we looked for Core changes that might explain the regressions seen in comment:6? The runtime regressions shown look as though they may be real; it would be nice to have at least some idea of what is happening here. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10829#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler